终轧温度对2024铝合金晶间腐蚀和力学性能的影响

Effect of Final Rolling Temperature on Intergranular Corrosion andMechanical Properties of 2024 Aluminum Alloy

对均匀化态2024铝合金进行不同终轧温度的热轧处理,经固溶后再进行为期4 d的自然时效。通过背散射电子衍射(EBSD)、X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学实验研究了终轧温度对2024铝合金力学性能和晶间腐蚀行为的影响。结果表明,轧态2024铝合金内存在剪切织构和少量再结晶织构,而固溶后出现了部分典型轧制织构。终轧温度影响合金组织和织构变化。终轧温度较低(207℃)时合金的平均晶粒尺寸和平均Schmid因子小,强度高;终轧温度较高(280℃)时合金小角度晶界和{111}面织构占比高,具有较大Schmid因子的织构含量少,抗晶间腐蚀性能优良。

The homogenized 2024 aluminum alloys were hot rolled at different final rolling temperatures,and they were naturally aged for 4 days after solid solution treatment.The effects of final rolling temperature on the mechanical properties and intergranular corrosion behavior of 2024 aluminum alloy were investigated by electron backscatter diffraction(EBSD),X-ray diffraction(XRD),scanning electron microscopy(SEM)and electrochemistry tests.The results show that there are shear textures and a small amount of recrystallization texture in rolled 2024 aluminum alloy,while some typical rolling textures appear after solid solution.The final rolling temperature affects the structure and texture changes of the alloy.When the final rolling temperature is low(207℃),the average grain size of the alloy is small,the average Schmid factor is low,and the strength is high;when the final rolling temperature is high(280℃),the proportion of low angle grain boundary and{111}plane texture is high,the texture content with large Schmid factor is small,and the intergranular corrosion resistance is excellent.